GMC 1995 Suburban Owner's Manual page 262

9. Then replace the
pressure cap. Be
sure the arrows
on the pressure
cap line up like
this.
Engine Fan Noise
Your vehicle has a clutched engine cooling fan. When the clutch is engaged,
the fan spins faster to provide more air to cool the engine. In most every day
driving conditions the fan is spinning slower and the clutch is not fully
engaged. This improves fuel economy and reduces fan noise. Under heavy
vehicle loading, trailer towing and/or high outside temperatures, the Pan
speed increases as the clutch more fully engages. So you may hear an
increase in fan noise. This is normal and should not be mistaken as the
transmission slipping or making extra shifts. It is merely the c,ooling system
functioning properly. The fan will slow down when additional cooling is
not
required and the clutch partially disengages.
You may also hear this fan noise when you start the engine. It
will go away
as the fan clutch partially disengages.
If a Tire Goes Flat
It's unusual for a tire to "blow out" while you're driving, especially if you
maintain your tires properly. If air goes out of a tire, it's much more likely to
leak out slowly. But if you should ever have a "blowout," here are a few tips
about what to expect and what to do:
If a front tire fails, the flat tire will create a drag that pulls the vehicle
toward that side. Take your foot off the accelerator pedal and grip the
steering wheel firmly. Steer to maintain lane position, then gently brake to a
stop well out of the traffic lane.
A rear blowout, particularly on a curve, acts much like a skid and may
require the same correction you'd use in a skid. In any rear blowout, remove
your foot from the accelerator pedal. Get the vehicle under control by
steering the way you want the vehicle to go. It may be very bumpy and
noisy, but you can still steer. Gently brake to a stop, well off the road
if
possible.
If a tire goes flat, the next part shows how to use your jacking equipment to
change a flat tire safely.
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